Testing water for contaminants and disease can take time, sometimes several days. People need to drink water in the meantime. Enter Sonaar Luthra, a quick test to determine if water is fit to drink.
This TED talk is just over three minutes long and explains the method.
http://www.ted.com/talks/sonaar_luthra_meet_the_water_canary.html
Stagnant water in Port-au-Prince, Haiti via arindambanerjee / Shutterstock.com
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